ICD-10-CM > N00-N99 > N80-N98 > N80 > N80.4 N80.4 Endometriosis of rectovaginal septum and vagina Non-Billable/Non-Specific Codes N80.40Endometriosis of rectovaginal septum, unspecified involvement of vaginaN80.41Endometriosis of rectovaginal septum without involvement of vaginaN80.42Endometriosis of rectovaginal septum with involvement of vagina